N° 8 Mk I trainer fitted with an A. J. Parker 8/53 sight attachment

[Didier]

PH No 5D was used for the No8 it did not use the threaded hole as used for the ejector on the No4 .It had a higher mounting arm than the PH 5 and used threaded holes on the left side of the receiver. One that was much higher then found on the .303 cal. No4 and the hole just in front of the safety . that is not found on the No4 .

Thank you.
So, if I got it right, the receiver of my No. 8 is already threaded to accommodate such a PH No 5D sight?

Here are some better pictures: